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The Thompson Sub-Machine gun is also known as the 'tommy gun' it was used between 1938-1971 and was designed by John Thompson. The was blow-back operated and could fire 700 rounds per minute. The M1A1 version of the Thompson had either 20 or 30 round capacity magazines. It played quite a part in world war 2 for the allies. The maximum ammunition the gun can hold is upto 360 rounds. The fire mode of the gun is automatic.